I would like to say this was my idea, but I stole it from someone else. I didn't like the idea of CS'ing into the nutplate, so I made up a couple of Jigs. The result is perfect every time. For the jig, I took a piece of 1/8" aluminum and drilled a 426 rivet hole #40 bit, then attached a nutplate with a cleco and drilled the other rivet hole. Once both holes were secured with clecos, I drilled a hole through the screw hole with I think a #21 drill bit to make sure the hole was centered. Then I got it to a correct size for the CS pilot to fit in it perfectly. I had to file down the rivets a little to keep them from protruding too much from underneath, which would have interfered with the CS cutter. I used Duct tape to hold the rivets in because on the MS21053-L08, you have to flip it over, so both sides of the jig are CS for the rivets. Now use the cleco clamps to hold the jig in place and go for it. I spoke with Bob at Avery and he said he may make this jig if demand calls for it. Best advice... always practice on scraps until you get it perfect. More advice... always read carefully as to which side the nutplate goes on and read at least the whole page you are working on (at least), before you start. I thought I was going to be buying a new spar, but alas, it was fixable and those nutplates are for a "future" power supply for lights. Hope this helps.